KIJIHIVE-55. KijiHive fails to build against CDH5

- Updates Hive dependency to cdh5.0.3 version.
- Fixes around generics in a test.
- Changes return of getSerializedClass() in KijiTableSerDe.

issue: https://jira.kiji.org/browse/KIJIHIVE-55
review: https://review.kiji.org/r/2140